安卓Dialog实现透明背景

http://blog.csdn.net/ithouse/article/details/52439023

AlertDialog alertDialog = new AlertDialog.Builder(activity).create();        alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable());        alertDialog.show();        alertDialog.setContentView(R.layout.dialog_loading);        alertDialog.setCanceledOnTouchOutside(false);
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xml文件中根节点的高最好是具体数值，比如250dp，然后背景颜色设为transparent即可。例如：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:layout_width="match_parent"    android:layout_height="250dp"    android:background="@color/transparent">    <com.wzkj.vzone.org.widget.progress.AVLoadingIndicatorView        android:id="@+id/progressBar1"        android:layout_width="50dp"        android:layout_height="50dp"        android:layout_centerInParent="true"        app:indicator="BallSpinFadeLoader"        app:indicator_color="@color/titlecolor" /></RelativeLayout>